Hi Phillip I’m getting those codes in my 2010 Audi Q5 with only 80K P0491 P0492 air injection pump do not work in cold I test the pump ok I checked fuse ok and remove the relay to check power in one pin power all the time 2nd pin power while turn the switch. On but the one the ECM controlling it has 4.8 when it’s cold or hot thanks for taking your time
At the air pump relay will the pump run if you jump pin 30 to 87? The ecm grounds the relay when the engine is started cold for about 60 seconds. You can hook a conventional test light across pins 85 and 86 at the relay, start the engine and the light should turn on. If it does not yet you have power to one pin with the key on you need to check continuity to the DME (PCM).
Here's an EASY TEST you can do to rule some things out: Find the intake tube of the SAI pump, it's usually directly connected to air intake box. Remove the air intake box if necessary and disconnect it so you can see the open of end of the intake tube. Now when the vehicle is dead cold and hasn't been running in some time, start the engine, leave it in park with the hood open, and then run around the front and see if the pump turns on. If the pump doesn't turn on check the fuse and the SAI pump relay in ECU box, typically under the hood or compartment below the steering wheel. The relay terminals sometimes turn black when it's going bad. Also check the wires leading to the SAI pump for damage. If all are good then you may need to replace your pump, but that's typically rare. If the pump turns on, is there a good amount of suction at the end of the intake tube? There should be. If not, then you either have a bad pump, a clogged intake line, clogged tubes that lead to the exhaust manifold, faulty solenoids that control the combi vales, or faulty (stuck closed) combi valves, OR worst case scenario, clogged ports in the engine head that exit each exhaust port. That's a very costly and time consuming fix. If the pump turns on and you have good suction, then that means the ECU is sending signal, intake tube is good, SAI pump is good, but you may have broken hoses OR, a big OR, you may have had a clogged foam filter in your air intake box that the SAI pump intake tube was attached to and by you disconnecting it you actually without knowing fixed the problem. I'd recommend replacing this foam filter as they disintegrate and also clog up overtime. To rule out broken hoses simply activate your SAI pump manually by applying 12 volts directly to it with the engine off. The pump should turn on but little suction is made at the end of the intake tube. That's normal. With the engine off, the SAI system is closed, so the air should have no where to exit and thus very little to no suction even when the SAI pump is running. That's a good sign and that means you don't have broken lines. The combi valves and solenoids could still be bad and stuck in the closed position preventing air from entering your exhaust when the system is activated by the ECU but that was ruled out when you cold started the vehicle and felt a good amount of suction at the intake tube when the system was activated. It's all trial and error, but no one ever mentioned utilizing the intake tube as a convenient means of diagnosis. Accessing the combi valves and inspecting all the lines is FAR more difficult than simply powering the SAI pump when the system is activated by the ECU and when you manually activate the pump when the SAI system is inactive. Best of luck
On my S4, the fuse and relay for the secondary air injection were located in the cowl inside the box where the ECU lives. There is also a relay and fuse under the panel under the steering wheel where the knee bolster would be.
They also told me I contacted a bend valve and carbon buildup the car has 105k miles I never felt so depressed to have this car.. because I got it and swapped my Jeep Grand Cherokee.. I’m going with Lexus in the summer.
My air injection pump only stays on for 4 seconds then turns off at first start. It does have a lot of air pressure but may not be on long enough. Is 4 seconds too short of a time or is that about right for the time the pump needs to be on? TIA. Good video.
@@PhillipBailey Yes. P0491 and P0492. I had a shop do the carbon cleaning. When I got the car back (Porsche Cayenne s hybrid with 3.0T engine) the code was gone under pending codes but is still there in the permanent codes. It eventually retriggered the engine light and came up on the confirmed, pending, and permanent codes. The hose from the pump to the combi valves seemed in good shape when I replaced the pcv valve about 6 months ago. I figured I would check the pump, so I had someone start my car when it was cold, and it was on for a 4 second count. I checked this by disconnecting the hose in the front. It felt as it had some power but was on for only 4 seconds. Vacuum lines look in really good shape with no wear. Car is mainly garage kept and it seemed that way by previous owner as well. I really appreciate your time on this.
@BryanKerr-x1n if the carbon cleaning was done to correct the codes then you may have some recourse to have them diagnose it again. If there are no leaks and exhaust passages are cleaned then it could be a weak pump I guess.
@@BryanKerr-x1n I'd definitely replace the SAI relay and ask whether you did any computer mods/tunes, coding that may have changed this. Many tuners/coders now have the ability to change these settings. But try the relay. If that doesn't work it COULD be a bad SAI pump motor but that's unlikely. You could apply 12v directly to it and see if it runs good for a minute or so. Check the rivets as well on your pump, they tend to go bad. Again, I'd replace the relay first
Hi I've got a question, got a a6 c5 2003 motorcode asg, I've recently replaced my secondary airpump due to being at its end of its life, but now I've got p0491 and p0492 back after only 2 days... I've also let them replace the air filter and cleaned the O2 sensor... I'm a bit at a loss now... Edit: the airpump works when coldstarting, and the engine is a 4.2
Those codes are for lack of flow detected i believe. Could be a cracked air injection line between the air pump and cylinder heads. I read the plastic lines under the intake can crack. Could also be the cylinder head passages are carboned up. There is a bulletin on that. I'd start by making sure the outlet line at the pump is connected and not leaking. Then smoke test that line and watch for smoke from behind the engine or under the intake manifold. Last would be to clean the passages in the heads. Thats not easy. Hope this helps you
Great video Phil I'm having the same issue with 2010 Audi Q5 3.2. No voltage to run on the relay. What did you do after this video? How did you end up getting power at the relay control circuit? I did find that if the pressure sensor is unplugged my modis won't clear the code. The same happens with the pressure sensor plugged in. I assume the sensor is bad but why isn't the relay control circuit getting power?
One of the control pins should be live with the key on. Power comes from fuse 5 and that fuse feeds a number of other ECM controlled solenoids. If it was burnt you would have multiple codes. The relay is ground side controlled by the ECM. If you have VCDS you can try to perform a bidirectional test while idling. Note to activate the test the gas pedal must by put to the floor while running. The RPM is limited to around 1500 if I remember. The two scanners I was using in the video did not tell me this clearly. Either way the air pump should run for about 30 to 40 seconds on a cold start. In the next video I confirmed it that way. Then later with VCDS software. Hope this helps oh and BTW it may not run the pump if you have a current active fault code for the sensor or other components in the system..
Thanks for the quick reply, I will search for your next video. I started thinking that it might be possible that If the ecm detected a fault it would not activate the system. Where is the number 5 fuse location
@@billscritchfield5847 I'm sure the fuse is good but it's in the same fuse box by the wiper motor. Pull the relay, turn the ignition on and test for power at the 4 relay terminals. Two should have power, one live all the time and the other with the ignition on.
That's the problem, power at the relay from the 50 amp blower fuse no power at the relay command circuit. I changed the pressure sensor and now I'm able to reset the system. On a test drive trying to set monitors
@@billscritchfield5847 If you send me your email I can send you some diagrams that might help. There is a 9 pin connector somewhere in the engine bay that these circuits go through. that would be where I would look first. It is labeled D111 in the schematics on diagram 10 and 11.
Hello, I got the same issue my pump is good since I manually give power and it turns on, my 50a fuse is good, but on the relay only one terminal has power and another is ground the other 2 nothing. Why did yours received no power.
So if you bypass the two large pins at the relay that should send power to the air pump. The 50 amp fuse feeds the power. The two control pins are the smaller terminals. One should be live with the engine running but the other is only grounded for about 30 seconds on a cold start. The computer supplies the ground to the control. If you have a full function scanner tool you should be able to activate the pump but you are supposed to know that part of the activation criteria is to depress the accelerator to the floor during the test. The Autel scan tool did not mention this during the test. I bought VCDS for this vehicle. Since the pump is commanded on during the first few seconds of a cold start you can connect a test light across the motor connector, watch the light and start it cold. If the pump is running but you're still getting both codes then the air passages in the cylinder heads are likely plugged with carbon. This is very common and a huge PITA to fix. Good luck
These are performance codes for the secondary air injection system not delivering air to both backs. Can you hear the electric air pump during the first minute or so of a cold start. If not check the air pump under the right headlight. Doubt its related to the hesitation though. Not sure without seeing other data whats going on there. Check for induction leaks. Good luck
Hi Phillip. I just acquired a 2013 Audi S7. I am getting codes P0491 and P0492 (secondary air injection system bank 1 and 2) also codes P0172 and P0175 (system too rich bank 1 and 2). When I clear the codes they return almost right away. I am suspecting that insufficient air injection is triggering the system too rich code but I’m not sure. Have you come across this before and any suggestions? Thank you.
The air injection codes are due to insufficient air flow. On a cold start you should hear the electric air pump run i believe its near or under the right headlight inside inner fender. Only runs for about 60 seconds and in open loop. If its not running have it tested. Unfortunately that won't cause your rich codes. Likely has leaing fuel injectors. Need to monitor high pressure fuel pressure during a hot soak. If it does not rise then injectors are likely leaking. Does it sometime run rough for a few seconds on a hot or warm restart. Thats a sign fuel injectors are leaking. Google P0172 and 75 and you likely find a link to an audi forum where others have dealt with this. Don't forget to Google the car make and model too. HTH good luck
Thank you for your quick reply. At a cold start I hear a pretty loud knocking sound. I can’t pinpoint where it’s coming from but could be the secondary air pump. The knocking stops after about 45 seconds and is followed by a psssssss sound (like escaping air sound for about 3 seconds). After that all seems normal and engine runs well. Perhaps some sort of valve is stuck causing this? Engine starts well when cold aside from the loud knocking sound I described. When engine is hot, it is difficult to start. When it starts it dies right away unless I pump the gas pedal while cranking. If I do that it typically starts and runs ok. As you said, this might be injector issue or fuel pump maybe? I purchased the car at an auction but I believe it was sitting for about a year. Fuel tank was near empty and I did put in new fuel.
@@D12Diesel you have to try to source the noises while they are happening. I suppose the air pump could be failing. That would likely account for the air flow codes.
Hi, I have a P0492 error code coming up. Secondary air Injection air system bank 2 mailfunction... 1 is it serious? 2 is it a easy fix?? Thank you. Check engine light comes on every 1000km. From New Zealand.
Sorry just saw this message. These engines are prone to carbon build up in the air injection system passages in the cylinder heads. If this is the problem it requires specialized cleaning equipment and its quite a job. The other possibility is cracked plastic lines under the intake manifold that route the air from the air pump to each bank. These can be checked for leaks with a smoke machine but may require the intake removed to access. If you've cleared the code and it keeps consistently setting id recommend smoke testing for leaks first followed by cleaning. If you have a dealer in your area he should be familiar with the cleaing. HTH sorry for the late reply. Good luck
I have Audi A7 and I can’t pass inspection because of these codes I took it to the dealer because it’s under warranty.. here’s the kicker..they told me the warranty didn’t cover the repairs.. they charged me $3000usd..😤 I wonder if I was taken😝
carbon buildup in the air injection passages in these engines leads to insufficient air flow from the pump. These engines are prone to this issue as you will find if you do some more searching on forums. The dealer is probably stating ii's due to driving style and a normal condition. That sucks for you for sure. The other problem these engines have is the carbon buildup on the intake valves. This is usually corrected by walnut shell blasting and does not normally cause a bent valve unless a piece of carbon comes loose and then prevents the valve from closing normally and the piston then hits the valve. very expensive to repair. Good German engineering...
Thanks The customers car air pump was replaced before i got to it, but could not get it turn the pump on threw basic setting l called tech support Autel he told me I had a PCM issue! I am not happy with Autel of the autel scan tool. Isaw the car had to be running that did finally did allow it to work but i believe the ports are clogged. I am not happy with Autel
Hi Phill...I have the same exact car 2009 Audi Q5 3.2 FSI. Now the only issue is I have that the pump runs on every cold start..and every time it gives me the p0491&p0492 codes..when I check the values on my MaxiSys..it shows zero values for the ranges on both bank 1 and 2. Do you think it is an electrical issue or the connecting hoses to the valves and not connecting or blocked? thanks
Hi there. If you hear the air pump run for about a minute on a cold start then you might have a leak or blockage in the system. If you remove the air cleaner housing you will see the air pump under the headlight and a 1 inch plastic line coming up to the engine. Check for obvious leaks. You could smoke test it if you have access to a smoke machine. I've heard of the line cracking under the intake manifold. If there are no leaks and the pump actually blows Air when running then you likely have restricted passages in the cylinder heads. There is avTSB on cleaning them but it's quite involved. Hope this helps
Probably need to write down the codes then clear them so it Atleast tries to run the pump if codes are in it it might not try to even command it on. Sometimes I hate aftermarket scanners
Thanks. It cleared the codes fine but neither of my scanners would command it on but it was commanded on on a cold start the next day. I might have been doing something wrong too.
@@philh9238 yes I'm sure I could. The verus is just a tablet. I run Ford IDS on it. Little slow but functional. I'm going to look into VCDS next year. I keep getting more of these Audi and Volkswagon repairs.
im On the verge of buying the ford ids. How often does it bail you out? Between owning snap on and autel. I have the cardaq that I use for ford programming that’s all it does with fjds. Do you find ids a need to have or nice to have??
Hi Phillip I’m getting those codes in my 2010 Audi Q5 with only 80K P0491 P0492 air injection pump do not work in cold I test the pump ok I checked fuse ok and remove the relay to check power in one pin power all the time 2nd pin power while turn the switch. On but the one the ECM controlling it has 4.8 when it’s cold or hot thanks for taking your time
At the air pump relay will the pump run if you jump pin 30 to 87? The ecm grounds the relay when the engine is started cold for about 60 seconds. You can hook a conventional test light across pins 85 and 86 at the relay, start the engine and the light should turn on. If it does not yet you have power to one pin with the key on you need to check continuity to the DME (PCM).
Here's an EASY TEST you can do to rule some things out:
Find the intake tube of the SAI pump, it's usually directly connected to air intake box. Remove the air intake box if necessary and disconnect it so you can see the open of end of the intake tube.
Now when the vehicle is dead cold and hasn't been running in some time, start the engine, leave it in park with the hood open, and then run around the front and see if the pump turns on.
If the pump doesn't turn on check the fuse and the SAI pump relay in ECU box, typically under the hood or compartment below the steering wheel. The relay terminals sometimes turn black when it's going bad. Also check the wires leading to the SAI pump for damage. If all are good then you may need to replace your pump, but that's typically rare.
If the pump turns on, is there a good amount of suction at the end of the intake tube? There should be. If not, then you either have a bad pump, a clogged intake line, clogged tubes that lead to the exhaust manifold, faulty solenoids that control the combi vales, or faulty (stuck closed) combi valves, OR worst case scenario, clogged ports in the engine head that exit each exhaust port. That's a very costly and time consuming fix.
If the pump turns on and you have good suction, then that means the ECU is sending signal, intake tube is good, SAI pump is good, but you may have broken hoses OR, a big OR, you may have had a clogged foam filter in your air intake box that the SAI pump intake tube was attached to and by you disconnecting it you actually without knowing fixed the problem. I'd recommend replacing this foam filter as they disintegrate and also clog up overtime.
To rule out broken hoses simply activate your SAI pump manually by applying 12 volts directly to it with the engine off. The pump should turn on but little suction is made at the end of the intake tube. That's normal.
With the engine off, the SAI system is closed, so the air should have no where to exit and thus very little to no suction even when the SAI pump is running. That's a good sign and that means you don't have broken lines. The combi valves and solenoids could still be bad and stuck in the closed position preventing air from entering your exhaust when the system is activated by the ECU but that was ruled out when you cold started the vehicle and felt a good amount of suction at the intake tube when the system was activated.
It's all trial and error, but no one ever mentioned utilizing the intake tube as a convenient means of diagnosis. Accessing the combi valves and inspecting all the lines is FAR more difficult than simply powering the SAI pump when the system is activated by the ECU and when you manually activate the pump when the SAI system is inactive.
Best of luck
@@SpaceXForce fantastic tips! Thanks for the information
@@PhillipBailey You're welcome. Thank you for providing so much information to the public. Great guy!
On my S4, the fuse and relay for the secondary air injection were located in the cowl inside the box where the ECU lives. There is also a relay and fuse under the panel under the steering wheel where the knee bolster would be.
Thanks for the information.
Cheers for video Phillip, think it's time for u and I to buy VCDS! Cheers sandy
I'm seriously considering it. Do you have VCDS?
You have to do the test with the engine running and put your foot on the brake and gas at the same time. I know it sounds crazy
Yes I know that now but the scanner instructions were not clear. I did eventually figure it out.
Did you physically take the COMBI pipes off to check for air flow?
They also told me I contacted a bend valve and carbon buildup the car has 105k miles I never felt so depressed to have this car.. because I got it and swapped my Jeep Grand Cherokee.. I’m going with Lexus in the summer.
My air injection pump only stays on for 4 seconds then turns off at first start. It does have a lot of air pressure but may not be on long enough. Is 4 seconds too short of a time or is that about right for the time the pump needs to be on? TIA. Good video.
@BryanKerr-x1n it should vary with temperature. Usually staying on longer on a cold start. Is yours setting a code?
@@PhillipBailey Yes. P0491 and P0492. I had a shop do the carbon cleaning. When I got the car back (Porsche Cayenne s hybrid with 3.0T engine) the code was gone under pending codes but is still there in the permanent codes. It eventually retriggered the engine light and came up on the confirmed, pending, and permanent codes. The hose from the pump to the combi valves seemed in good shape when I replaced the pcv valve about 6 months ago. I figured I would check the pump, so I had someone start my car when it was cold, and it was on for a 4 second count. I checked this by disconnecting the hose in the front. It felt as it had some power but was on for only 4 seconds. Vacuum lines look in really good shape with no wear. Car is mainly garage kept and it seemed that way by previous owner as well. I really appreciate your time on this.
@BryanKerr-x1n if the carbon cleaning was done to correct the codes then you may have some recourse to have them diagnose it again. If there are no leaks and exhaust passages are cleaned then it could be a weak pump I guess.
@@PhillipBailey ok. Thanks for your help on this
@@BryanKerr-x1n I'd definitely replace the SAI relay and ask whether you did any computer mods/tunes, coding that may have changed this. Many tuners/coders now have the ability to change these settings. But try the relay. If that doesn't work it COULD be a bad SAI pump motor but that's unlikely. You could apply 12v directly to it and see if it runs good for a minute or so. Check the rivets as well on your pump, they tend to go bad. Again, I'd replace the relay first
Hi I've got a question, got a a6 c5 2003 motorcode asg, I've recently replaced my secondary airpump due to being at its end of its life, but now I've got p0491 and p0492 back after only 2 days... I've also let them replace the air filter and cleaned the O2 sensor... I'm a bit at a loss now... Edit: the airpump works when coldstarting, and the engine is a 4.2
Those codes are for lack of flow detected i believe. Could be a cracked air injection line between the air pump and cylinder heads. I read the plastic lines under the intake can crack. Could also be the cylinder head passages are carboned up. There is a bulletin on that. I'd start by making sure the outlet line at the pump is connected and not leaking. Then smoke test that line and watch for smoke from behind the engine or under the intake manifold. Last would be to clean the passages in the heads. Thats not easy. Hope this helps you
Great video Phil I'm having the same issue with 2010 Audi Q5 3.2. No voltage to run on the relay. What did you do after this video? How did you end up getting power at the relay control circuit? I did find that if the pressure sensor is unplugged my modis won't clear the code. The same happens with the pressure sensor plugged in. I assume the sensor is bad but why isn't the relay control circuit getting power?
One of the control pins should be live with the key on. Power comes from fuse 5 and that fuse feeds a number of other ECM controlled solenoids. If it was burnt you would have multiple codes. The relay is ground side controlled by the ECM. If you have VCDS you can try to perform a bidirectional test while idling. Note to activate the test the gas pedal must by put to the floor while running. The RPM is limited to around 1500 if I remember. The two scanners I was using in the video did not tell me this clearly. Either way the air pump should run for about 30 to 40 seconds on a cold start. In the next video I confirmed it that way. Then later with VCDS software. Hope this helps oh and BTW it may not run the pump if you have a current active fault code for the sensor or other components in the system..
Thanks for the quick reply, I will search for your next video. I started thinking that it might be possible that If the ecm detected a fault it would not activate the system. Where is the number 5 fuse location
@@billscritchfield5847 I'm sure the fuse is good but it's in the same fuse box by the wiper motor. Pull the relay, turn the ignition on and test for power at the 4 relay terminals. Two should have power, one live all the time and the other with the ignition on.
That's the problem, power at the relay from the 50 amp blower fuse no power at the relay command circuit. I changed the pressure sensor and now I'm able to reset the system. On a test drive trying to set monitors
@@billscritchfield5847 If you send me your email I can send you some diagrams that might help. There is a 9 pin connector somewhere in the engine bay that these circuits go through. that would be where I would look first. It is labeled D111 in the schematics on diagram 10 and 11.
Hello, I got the same issue my pump is good since I manually give power and it turns on, my 50a fuse is good, but on the relay only one terminal has power and another is ground the other 2 nothing. Why did yours received no power.
So if you bypass the two large pins at the relay that should send power to the air pump. The 50 amp fuse feeds the power. The two control pins are the smaller terminals. One should be live with the engine running but the other is only grounded for about 30 seconds on a cold start. The computer supplies the ground to the control. If you have a full function scanner tool you should be able to activate the pump but you are supposed to know that part of the activation criteria is to depress the accelerator to the floor during the test. The Autel scan tool did not mention this during the test. I bought VCDS for this vehicle. Since the pump is commanded on during the first few seconds of a cold start you can connect a test light across the motor connector, watch the light and start it cold. If the pump is running but you're still getting both codes then the air passages in the cylinder heads are likely plugged with carbon. This is very common and a huge PITA to fix. Good luck
thank-you, Best regards from Swiss ✌️
Glad it might have helped you.
2010 Audi Q5 code reads PO492 P0491 car hesitate a little when accelerating at high speed and sometimes turn off while in idle
These are performance codes for the secondary air injection system not delivering air to both backs. Can you hear the electric air pump during the first minute or so of a cold start. If not check the air pump under the right headlight. Doubt its related to the hesitation though. Not sure without seeing other data whats going on there. Check for induction leaks. Good luck
Hi Phillip. I just acquired a 2013 Audi S7. I am getting codes P0491 and P0492 (secondary air injection system bank 1 and 2) also codes P0172 and P0175 (system too rich bank 1 and 2). When I clear the codes they return almost right away. I am suspecting that insufficient air injection is triggering the system too rich code but I’m not sure. Have you come across this before and any suggestions? Thank you.
The air injection codes are due to insufficient air flow. On a cold start you should hear the electric air pump run i believe its near or under the right headlight inside inner fender. Only runs for about 60 seconds and in open loop. If its not running have it tested. Unfortunately that won't cause your rich codes. Likely has leaing fuel injectors. Need to monitor high pressure fuel pressure during a hot soak. If it does not rise then injectors are likely leaking. Does it sometime run rough for a few seconds on a hot or warm restart. Thats a sign fuel injectors are leaking. Google P0172 and 75 and you likely find a link to an audi forum where others have dealt with this. Don't forget to Google the car make and model too. HTH good luck
www.audiworld.com/forums/a8-s8-d4-platform-discussion-190/2013-s8-d4-p0172-p0175-just-got-car-2919347/
Thank you for your quick reply. At a cold start I hear a pretty loud knocking sound. I can’t pinpoint where it’s coming from but could be the secondary air pump. The knocking stops after about 45 seconds and is followed by a psssssss sound (like escaping air sound for about 3 seconds). After that all seems normal and engine runs well. Perhaps some sort of valve is stuck causing this?
Engine starts well when cold aside from the loud knocking sound I described. When engine is hot, it is difficult to start. When it starts it dies right away unless I pump the gas pedal while cranking. If I do that it typically starts and runs ok. As you said, this might be injector issue or fuel pump maybe?
I purchased the car at an auction but I believe it was sitting for about a year. Fuel tank was near empty and I did put in new fuel.
@@D12Diesel you have to try to source the noises while they are happening. I suppose the air pump could be failing. That would likely account for the air flow codes.
This is a common issue with 3.0T and 3.2 engines. Audi released a TSB. The ports in the cylinder head are clogged. 2000$ dealer only
Thanks I'm aware of the bulletin but the problem on this one was a failed air pump. The dealerships method of cleaning the ports is crazy though.
Crc intake valve and turbo cleaner works well in ports
@@5K7WLKR we aren’t talking carbon on the intake valves
Hi, I have a P0492 error code coming up. Secondary air Injection air system bank 2 mailfunction... 1 is it serious? 2 is it a easy fix?? Thank you. Check engine light comes on every 1000km. From New Zealand.
Sorry just saw this message. These engines are prone to carbon build up in the air injection system passages in the cylinder heads. If this is the problem it requires specialized cleaning equipment and its quite a job. The other possibility is cracked plastic lines under the intake manifold that route the air from the air pump to each bank. These can be checked for leaks with a smoke machine but may require the intake removed to access. If you've cleared the code and it keeps consistently setting id recommend smoke testing for leaks first followed by cleaning. If you have a dealer in your area he should be familiar with the cleaing. HTH sorry for the late reply. Good luck
@@PhillipBailey Thank you. This helps a lot. I will get it checked out when it goes for a service next due in 3 months.
I have Audi A7 and I can’t pass inspection because of these codes I took it to the dealer because it’s under warranty.. here’s the kicker..they told me the warranty didn’t cover the repairs.. they charged me $3000usd..😤 I wonder if I was taken😝
carbon buildup in the air injection passages in these engines leads to insufficient air flow from the pump. These engines are prone to this issue as you will find if you do some more searching on forums. The dealer is probably stating ii's due to driving style and a normal condition. That sucks for you for sure. The other problem these engines have is the carbon buildup on the intake valves. This is usually corrected by walnut shell blasting and does not normally cause a bent valve unless a piece of carbon comes loose and then prevents the valve from closing normally and the piston then hits the valve. very expensive to repair. Good German engineering...
@@PhillipBailey thanks I know now👌
@@nathanielholloway8267 yes I'm guessing you're learning the hard way.
Thanks The customers car air pump was replaced before i got to it, but could not get it turn the pump on threw basic setting l called tech support Autel he told me I had a PCM issue! I am not happy with Autel of the autel scan tool. Isaw the car had to be running that did finally did allow it to work but i believe the ports are clogged. I am not happy with Autel
What was the problem?
Failed Air Injection system pressure sensor initially then a seized Air pump. Among other repairs.
Hi Phill...I have the same exact car 2009 Audi Q5 3.2 FSI. Now the only issue is I have that the pump runs on every cold start..and every time it gives me the p0491&p0492 codes..when I check the values on my MaxiSys..it shows zero values for the ranges on both bank 1 and 2. Do you think it is an electrical issue or the connecting hoses to the valves and not connecting or blocked?
thanks
Hi there. If you hear the air pump run for about a minute on a cold start then you might have a leak or blockage in the system. If you remove the air cleaner housing you will see the air pump under the headlight and a 1 inch plastic line coming up to the engine. Check for obvious leaks. You could smoke test it if you have access to a smoke machine. I've heard of the line cracking under the intake manifold. If there are no leaks and the pump actually blows Air when running then you likely have restricted passages in the cylinder heads. There is avTSB on cleaning them but it's quite involved. Hope this helps
Probably need to write down the codes then clear them so it Atleast tries to run the pump if codes are in it it might not try to even command it on. Sometimes I hate aftermarket scanners
Thanks. It cleared the codes fine but neither of my scanners would command it on but it was commanded on on a cold start the next day. I might have been doing something wrong too.
Can’t you use vcds on the verus? Think I’ve seen people do that
@@philh9238 yes I'm sure I could. The verus is just a tablet. I run Ford IDS on it. Little slow but functional. I'm going to look into VCDS next year. I keep getting more of these Audi and Volkswagon repairs.
@@philh9238 just placed my order.
im On the verge of buying the ford ids. How often does it bail you out? Between owning snap on and autel. I have the cardaq that I use for ford programming that’s all it does with fjds. Do you find ids a need to have or nice to have??
Air pump relay